Vintage "the Dover" Round Banjo Pancake Oiler or Powder Flask Made in England

SMALL VINTAGE OILER marked: ” The Dover ” Made in England marked on screw-on tip: No. 519875 small flat round pancake banjo pocket oiler? or Powder Flask? Oiler Diameter is approx. 2″ Please look at all 10 photos, as they are part of the description SOLD AS IS